Bump coverallsapp/github-action from 1 to 2

Bumps [coverallsapp/github-action](https://github.com/coverallsapp/github-action) from 1 to 2.
- [Release notes](https://github.com/coverallsapp/github-action/releases)
- [Commits](coverallsapp/github-action@v1...v2)

---
updated-dependencies:
- dependency-name: coverallsapp/github-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/coverage.yml

@@ -15,4 +15,4 @@ jobs:
         docker-compose up --exit-code-from sut
         sudo sed -i 's#/root/.minetest/worlds/world/worldmods/blockexchange/##g' coverage/lcov.info
     - name: Coveralls
-      uses: coverallsapp/github-action@v1
+      uses: coverallsapp/github-action@v2